3240243221 has 4 divisors (see below), whose sum is σ = 3241106700. Its totient is φ = 3239379744.

The previous prime is 3240243191. The next prime is 3240243239. The reversal of 3240243221 is 1223420423.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1294992196 + 1945251025 = 35986^2 + 44105^2 .

It is a cyclic number.

It is not a de Polignac number, because 3240243221 - 2¹⁸ = 3239981077 is a prime.

It is a super-2 number, since 2×3240243221² = 20998352262472909682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3240243241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426086 + ... + 433623.

It is an arithmetic number, because the mean of its divisors is an integer number (810276675).

Almost surely, 2^3240243221 is an apocalyptic number.

It is an amenable number.

3240243221 is a deficient number, since it is larger than the sum of its proper divisors (863479).

3240243221 is an equidigital number, since it uses as much as digits as its factorization.

3240243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863478.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 3240243221 is about 56923.1343216447. The cubic root of 3240243221 is about 1479.7642704969.

Adding to 3240243221 its reverse (1223420423), we get a palindrome (4463663644).

The spelling of 3240243221 in words is "three billion, two hundred forty million, two hundred forty-three thousand, two hundred twenty-one".